It is very easy to use as it has everything you need in one place without any distractions or extra add-ons that will slow down performance (such us JIRA).
The UI can be improved by adding more icons/pictures etc when navigating between screens but this doesn't really bother me too much since I'm not using other tools like MS Project which does have some great features! If there was something better than Excel out then we would definitely switch over because our previous system didn’t even come close with how hard they made things look / confusing at times compared to their competitors who were easier going through them. We had no idea what kind of problems users where facing due to inconsistent information being stored across multiple platforms; however now its solved thanks to Mums masterdata management tool!!